drivers/misc/tifm_7xx1.c

   1 /*
   2  *  tifm_7xx1.c - TI FlashMedia driver
   3  *
   4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/tifm.h>
  13 #include <linux/dma-mapping.h>
  14
  15 #define DRIVER_NAME "tifm_7xx1"
  16 #define DRIVER_VERSION "0.8"
  17
  18 #define TIFM_IRQ_ENABLE           0x80000000
  19 #define TIFM_IRQ_SOCKMASK(x)      (x)
  20 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
  21 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
  22 #define TIFM_IRQ_SETALL           0xffffffff
  23
  24 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  25                                   struct tifm_dev *sock)
  26 {
  27 }
  28
  29 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  30 {
  31         unsigned long flags;
  32
  33         spin_lock_irqsave(&fm->lock, flags);
  34         fm->socket_change_set |= 1 << sock->socket_id;
  35         tifm_queue_work(&fm->media_switcher);
  36         spin_unlock_irqrestore(&fm->lock, flags);
  37 }
  38
  39 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  40 {
  41         struct tifm_adapter *fm = dev_id;
  42         struct tifm_dev *sock;
  43         unsigned int irq_status, cnt;
  44
  45         spin_lock(&fm->lock);
  46         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  47         if (irq_status == 0 || irq_status == (~0)) {
  48                 spin_unlock(&fm->lock);
  49                 return IRQ_NONE;
  50         }
  51
  52         if (irq_status & TIFM_IRQ_ENABLE) {
  53                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  54
  55                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  56                         sock = fm->sockets[cnt];
  57                         if (sock) {
  58                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  59                                         sock->data_event(sock);
  60                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  61                                         sock->card_event(sock);
  62                         }
  63                 }
  64
  65                 fm->socket_change_set |= irq_status
  66                                          & ((1 << fm->num_sockets) - 1);
  67         }
  68         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  69
  70         if (fm->finish_me)
  71                 complete_all(fm->finish_me);
  72         else if (!fm->socket_change_set)
  73                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  74         else
  75                 tifm_queue_work(&fm->media_switcher);
  76
  77         spin_unlock(&fm->lock);
  78         return IRQ_HANDLED;
  79 }
  80
  81 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  82 {
  83         unsigned int s_state;
  84         int cnt;
  85
  86         writel(0x0e00, sock_addr + SOCK_CONTROL);
  87
  88         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  89                 if (!(TIFM_SOCK_STATE_POWERED
  90                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  91                         break;
  92
  93                 msleep(cnt);
  94         }
  95
  96         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  97         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  98                 return 0;
  99
 100         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
 101                sock_addr + SOCK_CONTROL);
 102
 103         /* xd needs some extra time before power on */
 104         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 105             == TIFM_TYPE_XD)
 106                 msleep(40);
 107
 108         writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
 109         /* wait for power to stabilize */
 110         msleep(20);
 111         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 112                 if ((TIFM_SOCK_STATE_POWERED
 113                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 114                         break;
 115
 116                 msleep(cnt);
 117         }
 118
 119         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 120                sock_addr + SOCK_CONTROL);
 121
 122         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 123 }
 124
 125 inline static char __iomem *
 126 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 127 {
 128         return base_addr + ((sock_num + 1) << 10);
 129 }
 130
 131 static void tifm_7xx1_switch_media(struct work_struct *work)
 132 {
 133         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 134                                                media_switcher);
 135         struct tifm_dev *sock;
 136         unsigned long flags;
 137         unsigned char media_id;
 138         unsigned int socket_change_set, cnt;
 139
 140         spin_lock_irqsave(&fm->lock, flags);
 141         socket_change_set = fm->socket_change_set;
 142         fm->socket_change_set = 0;
 143
 144         dev_dbg(fm->cdev.dev, "checking media set %x\n",
 145                 socket_change_set);
 146
 147         if (!socket_change_set) {
 148                 spin_unlock_irqrestore(&fm->lock, flags);
 149                 return;
 150         }
 151
 152         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 153                 if (!(socket_change_set & (1 << cnt)))
 154                         continue;
 155                 sock = fm->sockets[cnt];
 156                 if (sock) {
 157                         printk(KERN_INFO
 158                                "%s : demand removing card from socket %u:%u\n",
 159                                fm->cdev.class_id, fm->id, cnt);
 160                         fm->sockets[cnt] = NULL;
 161                         spin_unlock_irqrestore(&fm->lock, flags);
 162                         device_unregister(&sock->dev);
 163                         spin_lock_irqsave(&fm->lock, flags);
 164                         writel(0x0e00, tifm_7xx1_sock_addr(fm->addr, cnt)
 165                                + SOCK_CONTROL);
 166                 }
 167
 168                 spin_unlock_irqrestore(&fm->lock, flags);
 169
 170                 media_id = tifm_7xx1_toggle_sock_power(
 171                                 tifm_7xx1_sock_addr(fm->addr, cnt));
 172
 173                 // tifm_alloc_device will check if media_id is valid
 174                 sock = tifm_alloc_device(fm, cnt, media_id);
 175                 if (sock) {
 176                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 177
 178                         if (!device_register(&sock->dev)) {
 179                                 spin_lock_irqsave(&fm->lock, flags);
 180                                 if (!fm->sockets[cnt]) {
 181                                         fm->sockets[cnt] = sock;
 182                                         sock = NULL;
 183                                 }
 184                                 spin_unlock_irqrestore(&fm->lock, flags);
 185                         }
 186                         if (sock)
 187                                 tifm_free_device(&sock->dev);
 188                 }
 189                 spin_lock_irqsave(&fm->lock, flags);
 190         }
 191
 192         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 193                | TIFM_IRQ_CARDMASK(socket_change_set),
 194                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 195
 196         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 197                | TIFM_IRQ_CARDMASK(socket_change_set),
 198                fm->addr + FM_SET_INTERRUPT_ENABLE);
 199
 200         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 201         spin_unlock_irqrestore(&fm->lock, flags);
 202 }
 203
 204 #ifdef CONFIG_PM
 205
 206 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 207 {
 208         dev_dbg(&dev->dev, "suspending host\n");
 209
 210         pci_save_state(dev);
 211         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 212         pci_disable_device(dev);
 213         pci_set_power_state(dev, pci_choose_state(dev, state));
 214         return 0;
 215 }
 216
 217 static int tifm_7xx1_resume(struct pci_dev *dev)
 218 {
 219         struct tifm_adapter *fm = pci_get_drvdata(dev);
 220         int rc;
 221         unsigned int good_sockets = 0, bad_sockets = 0;
 222         unsigned long flags;
 223         unsigned char new_ids[fm->num_sockets];
 224         DECLARE_COMPLETION_ONSTACK(finish_resume);
 225
 226         pci_set_power_state(dev, PCI_D0);
 227         pci_restore_state(dev);
 228         rc = pci_enable_device(dev);
 229         if (rc)
 230                 return rc;
 231         pci_set_master(dev);
 232
 233         dev_dbg(&dev->dev, "resuming host\n");
 234
 235         for (rc = 0; rc < fm->num_sockets; rc++)
 236                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 237                                         tifm_7xx1_sock_addr(fm->addr, rc));
 238         spin_lock_irqsave(&fm->lock, flags);
 239         for (rc = 0; rc < fm->num_sockets; rc++) {
 240                 if (fm->sockets[rc]) {
 241                         if (fm->sockets[rc]->type == new_ids[rc])
 242                                 good_sockets |= 1 << rc;
 243                         else
 244                                 bad_sockets |= 1 << rc;
 245                 }
 246         }
 247
 248         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 249                fm->addr + FM_SET_INTERRUPT_ENABLE);
 250         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 251                 good_sockets, bad_sockets);
 252
 253         fm->socket_change_set = 0;
 254         if (good_sockets) {
 255                 fm->finish_me = &finish_resume;
 256                 spin_unlock_irqrestore(&fm->lock, flags);
 257                 rc = wait_for_completion_timeout(&finish_resume, HZ);
 258                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
 259                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 260                        | TIFM_IRQ_CARDMASK(good_sockets),
 261                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 262                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 263                        | TIFM_IRQ_CARDMASK(good_sockets),
 264                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 265                 spin_lock_irqsave(&fm->lock, flags);
 266                 fm->finish_me = NULL;
 267                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 268         }
 269
 270         fm->socket_change_set |= bad_sockets;
 271         if (fm->socket_change_set)
 272                 tifm_queue_work(&fm->media_switcher);
 273
 274         spin_unlock_irqrestore(&fm->lock, flags);
 275         writel(TIFM_IRQ_ENABLE,
 276                fm->addr + FM_SET_INTERRUPT_ENABLE);
 277
 278         return 0;
 279 }
 280
 281 #else
 282
 283 #define tifm_7xx1_suspend NULL
 284 #define tifm_7xx1_resume NULL
 285
 286 #endif /* CONFIG_PM */
 287
 288 static int tifm_7xx1_probe(struct pci_dev *dev,
 289                            const struct pci_device_id *dev_id)
 290 {
 291         struct tifm_adapter *fm;
 292         int pci_dev_busy = 0;
 293         int rc;
 294
 295         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 296         if (rc)
 297                 return rc;
 298
 299         rc = pci_enable_device(dev);
 300         if (rc)
 301                 return rc;
 302
 303         pci_set_master(dev);
 304
 305         rc = pci_request_regions(dev, DRIVER_NAME);
 306         if (rc) {
 307                 pci_dev_busy = 1;
 308                 goto err_out;
 309         }
 310
 311         pci_intx(dev, 1);
 312
 313         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 314                                 ? 4 : 2, &dev->dev);
 315         if (!fm) {
 316                 rc = -ENOMEM;
 317                 goto err_out_int;
 318         }
 319
 320         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 321         fm->eject = tifm_7xx1_eject;
 322         pci_set_drvdata(dev, fm);
 323
 324         fm->addr = ioremap(pci_resource_start(dev, 0),
 325                            pci_resource_len(dev, 0));
 326         if (!fm->addr)
 327                 goto err_out_free;
 328
 329         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
 330         if (rc)
 331                 goto err_out_unmap;
 332
 333         rc = tifm_add_adapter(fm);
 334         if (rc)
 335                 goto err_out_irq;
 336
 337         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 338                fm->addr + FM_SET_INTERRUPT_ENABLE);
 339         return 0;
 340
 341 err_out_irq:
 342         free_irq(dev->irq, fm);
 343 err_out_unmap:
 344         iounmap(fm->addr);
 345 err_out_free:
 346         pci_set_drvdata(dev, NULL);
 347         tifm_free_adapter(fm);
 348 err_out_int:
 349         pci_intx(dev, 0);
 350         pci_release_regions(dev);
 351 err_out:
 352         if (!pci_dev_busy)
 353                 pci_disable_device(dev);
 354         return rc;
 355 }
 356
 357 static void tifm_7xx1_remove(struct pci_dev *dev)
 358 {
 359         struct tifm_adapter *fm = pci_get_drvdata(dev);
 360
 361         fm->eject = tifm_7xx1_dummy_eject;
 362         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 363         mmiowb();
 364         free_irq(dev->irq, fm);
 365
 366         tifm_remove_adapter(fm);
 367
 368         pci_set_drvdata(dev, NULL);
 369
 370         iounmap(fm->addr);
 371         pci_intx(dev, 0);
 372         pci_release_regions(dev);
 373
 374         pci_disable_device(dev);
 375         tifm_free_adapter(fm);
 376 }
 377
 378 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 379         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 380           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 381         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 382           PCI_ANY_ID, 0, 0, 0 },
 383         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 384           PCI_ANY_ID, 0, 0, 0 },
 385         { }
 386 };
 387
 388 static struct pci_driver tifm_7xx1_driver = {
 389         .name = DRIVER_NAME,
 390         .id_table = tifm_7xx1_pci_tbl,
 391         .probe = tifm_7xx1_probe,
 392         .remove = tifm_7xx1_remove,
 393         .suspend = tifm_7xx1_suspend,
 394         .resume = tifm_7xx1_resume,
 395 };
 396
 397 static int __init tifm_7xx1_init(void)
 398 {
 399         return pci_register_driver(&tifm_7xx1_driver);
 400 }
 401
 402 static void __exit tifm_7xx1_exit(void)
 403 {
 404         pci_unregister_driver(&tifm_7xx1_driver);
 405 }
 406
 407 MODULE_AUTHOR("Alex Dubov");
 408 MODULE_DESCRIPTION("TI FlashMedia host driver");
 409 MODULE_LICENSE("GPL");
 410 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 411 MODULE_VERSION(DRIVER_VERSION);
 412
 413 module_init(tifm_7xx1_init);
 414 module_exit(tifm_7xx1_exit);